Date: Oct 23, 2012 11:24 PM
Author: Carole Stevens
Subject: Re: [ap-calculus] Double Derivatives

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Not necessarily. You need to see if the second derivative changes sign
across that critical number. If so, then it's a POI, if not, it isn't.

*Carole Stevens
*Monsignor Kelly Catholic High School<http://www.monsignorkellyhighschool.com/>


On Tue, Oct 23, 2012 at 4:12 PM, Debbie Bricker <
DBricker@cathedralcatholic.org> wrote:

>
> NOTE:
> This ap-calculus EDG will be closing in the next few weeks. Please sign up
> for the new AP Calculus
> Teacher Community Forum at
> https://apcommunity.collegeboard.org/getting-started
> and post messages there.
>
> ----------------------------------------------------------------------------------------------------------------------------
> In using the second derivative test for extrema, you may get the second
> derivative to equal zero when plugging in a critical number and the test
> then fails. Will this point then be a POI?
>
> Debbie
>
> To search the list archives for previous posts go to
> http://lyris.collegeboard.com/read/?forum=ap-calculus
>


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